Projector suspension device

ABSTRACT

A projector suspension device for a projector comprises a base to be fixed to a surface on which the projector projects an image, a support member extending from the base and configured to support the projector, and an adjustment mechanism configured to adjust a tilt of the projector.

CROSS-REFERENCE

The present application is a continuation application of U.S. patentapplication Ser. No. 12/815,499 filed on Jun. 15, 2010, which claimspriority from Japanese Patent Application No. 2009-145049 filed on Jun.18, 2009, which are hereby incorporated by reference in their entirety.

BACKGROUND

1. Technical Field

The present invention relates to a projector suspension device.

2. Related Art

Heretofore, a projector ceiling suspension device has been one to whicha projector is fixed suspended from a ceiling. The projector ceilingsuspension device, by being installed on the ceiling to fix theprojector, causes an image projected from the projector to be projectedonto a screen installed on a wall surface of a room, a self-standingscreen, or the like. The projector ceiling suspension device is suchthat, when fixing the projector, the mounting position of the projectoris adjusted and fixed in such a way that the image is projected onto aprojection region on the screen.

FIGS. 10A and 10B are schematic configuration diagrams of a heretoforeknown projector ceiling suspension device, where FIG. 10A is a frontview, and FIG. 10B a side view.

As shown in FIGS. 10A and 10B, the projector ceiling suspension deviceincludes a ceiling suspension position adjustment mechanism 850. Theceiling suspension position adjustment mechanism 850 is roughlyconfigured of a base member 851 fixed to a ceiling 810, a movable member852 to which a projector 800 is fixed, pin members 853 which, beingdisposed in overlapping portions of the side surfaces of the base member851 and the side surfaces of the movable member 852, make the movablemember 852 pivotable with respect to the base member 851, and screwmembers 855 which fix the base member 851 and movable member 852 bypressing the overlapping portions of the base member 851 and movablemember 852 together from either side in the vicinity of each pin member853. Movement slots 854 having an approximate racetrack shape with eachpin member 853 as the center of rotation are formed in portions of themovable member 852 through which the screw members 855 are inserted.

With this structure, it is possible for the projector 800 to move aroundthe pin members 853 within the range of the movement slots 854 (in thiscase, the angle adjustment of the projector 800 can be carried out). Theposition adjustment of the projector 800 is to adjust the position ofthe projector 800 in such a way that a position (a projection position)onto which is projected the image projected from the projector 800 isaligned with a projection region on a screen. The fixation of theprojector 800 can be carried out by tightening the screw members 855while holding the projector 800 subjected to the position adjustment (inthis case, the angle adjustment) in the position, thereby pressing theoverlapping side surface portions of the base member 851 and movablemember 852, and fixing the movable member 852 to the base member 851.

Although not shown, apart from the structure wherein the base member 851is fixed directly to the ceiling 810, there is also a projector ceilingsuspension device of a structure wherein a slide member to which thebase member 851 is fixed so as to be slidable in a left-right directionor a front-back direction, or the like, is used between the base member851 and ceiling 810. The position adjustment of the projector 800 inthis case is such that, firstly, a position in the left-right directionor front-back direction of the projector 800 is roughly determined usingthe slide member, and the slide member and base member 851 are fixed bya screw member, or the like. Subsequently, the heretofore describedposition adjustment is carried out.

With the ceiling suspension position adjustment mechanism 850 of thiskind of projector ceiling suspension device, a position adjustor (auser, or the like, of the projector), needing to carry out the positionadjustment by supporting the projector, is burdened with the positionadjustment. Also, with this kind of ceiling suspension positionadjustment mechanism 850, as space, or the like, between componentmembers is large, taking into account also a movement by an amountequivalent to the space during a screw fixation after the adjustment,and the like, it is impossible to carry out the position adjustment witha high precision.

In particular, when the projector is configured as a so-called shortfocus projector which, including a projection optical device having areflecting mirror, causes an image magnification projection onto ascreen at a short distance, as a slight misalignment in the positionadjustment results in the image being projected with a largemisalignment, a higher precision position adjustment (a fine adjustment)has been required in comparison with the heretofore known positionadjustment.

Consequently, a projector ceiling suspension device has been demandedwherein it is possible to reliably carry out a high precision positionadjustment (a fine adjustment), and a burden of the adjustment isreduced by improving an adjustment operability.

SUMMARY

An advantage of some aspects of the invention is to solve at least apart of the problems described above, and the invention can be embodiedas the following embodiments or application examples.

Application Example 1

According to this application example, a projector suspension deviceincluding a projection optical device having a reflecting mirror, and asuspension position adjustment mechanism. The suspension positionadjustment mechanism includes A. a pressing member which presses a firstmember and a second member, B. a screw member which, being fixed in thefirst member, passes through the second member, and C. a turning memberwhich, by turning in threaded engagement with the screw member passingthrough the second member, adjusts the angle formed by the first memberand second member, against the pressing force of the pressing member,with a pivot set perpendicular to the axial direction of the screwmember as the center.

According to this kind of projector suspension device, it is possible toconfigure a suspension position adjustment mechanism with a simpleconfiguration including the pressing member, screw member, and turningmember. Also, with the suspension position adjustment mechanism, it ispossible to prevent a rattling due to space between component members byapplying a pressing force with the pressing member and, while reliablymaintaining an adjusted angle, adjust (fine adjust) the angle formed bythe first member and second member by an operation of turning theturning member. Because of this, it is possible to reliably carry out ahigh precision position adjustment (a fine adjustment) with respect tothe projector including the projection optical device having thereflecting mirror. In particular, when the projector is a so-calledshort focus projector which, including a projection optical devicehaving a reflecting mirror, causes an image magnification projectiononto a screen at a short distance, a small tilt (misalignment) of theprojector leads to a large tilt (misalignment) of a projection position.As opposed to this, it is highly advantageous that the high precisionposition adjustment (fine adjustment) which adjusts the small tilt canbe reliably carried out using the suspension position adjustmentmechanism. Also, by fixing the projector to one of the first member andsecond member, as well as it being possible to carry out the angleadjustment of the projector, there is no need for an adjustor (a user,or the like) to adjust the projector while holding it, as heretoforeknown, meaning that it is possible to improve an adjustment operability,and it is possible to reduce a burden of the position adjustment on theadjustor.

Application Example 2

With the projector suspension device according to the applicationexample, it is preferable that the screw member is disposed insertedthrough the pressing member.

According to this kind of projector suspension device, as aconfiguration is such that the screw member is disposed inserted throughthe pressing member, it is possible to miniaturize the suspensionposition adjustment mechanism in comparison with a configuration whereinthe screw member and pressing member are disposed separately, thusrealizing the miniaturization of the projector suspension device.

Application Example 3

With the projector suspension device according to the applicationexample, it is preferable that the pressing member is formed of a coilspring.

According to this kind of projector suspension device, as the pressingmember is formed of a coil spring, it is possible to achieve a furtherminiaturization of the suspension position adjustment mechanism (afurther miniaturization of the projector suspension device), and itbecomes easier to design and process the pressing member.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be described with reference to the accompanyingdrawings, wherein like numbers reference like elements.

FIGS. 1A and 1B are perspective views of a projector mounted on aprojector suspension device of an embodiment, where FIG. 1A is aperspective view of a condition in which the top surface faces upward,and FIG. 1B is a perspective view of a condition in which the bottomsurface faces upward.

FIG. 2 is a plan view schematically showing an optical system of theprojector.

FIG. 3 is a perspective view showing a condition in which the projectoris fixed to a projector suspension device.

FIGS. 4A and 4B are drawings showing a condition in which the projectoris fixed to the projector suspension device, and a projection is doneonto a screen, where FIG. 4A is a front view, and FIG. 4B a side view.

FIG. 5 is an assembly diagram of a suspension position adjustmentmechanism.

FIG. 6 is an assembly diagram of the suspension position adjustmentmechanism.

FIG. 7 is a drawing of a condition in which a horizontal roll adjustmentis carried out, seen from a back direction.

FIG. 8 is a drawing of a condition in which an up-down tilt adjustmentis carried out, seen from a right direction.

FIG. 9 is a drawing of a condition in which a horizontal rotationadjustment is carried out, seen from above.

FIGS. 10A and 10B are schematic configuration diagrams of a heretoforeknown projector suspension device, where FIG. 10A is a front view, andFIG. 10B a side view.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

Hereafter, a description will be given, based on the drawings, of anembodiment.

Embodiment

FIGS. 1A and 1B are perspective views of a projector mounted on aprojector suspension device of the embodiment, where FIG. 1A is aperspective view of a condition in which the top surface faces upward,and FIG. 1B is a perspective view of a condition in which the bottomsurface faces upward. Referring to FIGS. 1A and 1B, a description willbe given of an external configuration, and an operation, of a projector5.

The projector 5, based on an image signal, modulates a luminous fluxemitted from a light source (a light source lamp 41) (refer to FIG. 2)with light modulation elements (liquid crystal panels 451) (refer toFIG. 2), forming an optical image, and projects the optical image onto ascreen S (refer to FIGS. 4A and 4B), or the like, as an image (forexample, a color image) via a projection optical device 47 (refer toFIG. 2).

As shown in FIG. 1A, the projector 5 is covered with an exterior housing511 of an approximately rectangular parallelepiped shape. The projector5 includes inside the exterior housing 511 an optical unit 4, to bedescribed hereafter, a circuitry (not shown) configured including, forexample, a controller (not shown) for causing the projector 5 tooperate, and the like.

A switch section 512 with which an operation input is carried out, adustproof projection window 513 through which a projection image istransmitted, and the like, are disposed on a top surface 5 a of theprojector 5. The projection optical device 47, to be describedhereafter, is disposed on the inner surface side of the projectionwindow 513 (inside the exterior housing 511), and the projection imageemitted from the projection optical device 47 is projected from the topsurface 5 a side toward a back surface 5 c side, via the projectionwindow 513.

As shown in FIG. 1B, four fixing legs 514 for fixing the projector 5 toa suspension position adjustment mechanism 1, included in a projectorsuspension device 2 of the embodiment, when the projector 5 is installedsuspended from a ceiling or a wall are disposed protruded. Specifically,the fixing legs 514 being formed with nuts (not shown) inserted therein,the projector 5 is fixed to the suspension position adjustment mechanism1 by fixing screw members being threadedly engaged with the nuts. Also,an opening portion 515 is disposed in the bottom surface 5 b. A cable orthe like (not shown) connected to the projector 5, being inserted in theopening portion 515, is connected to an interface substrate (not shown)disposed inside the exterior housing 511.

The projector 5 of the embodiment, being configured on the premise thatit is installed suspended from the ceiling or wall, has a structurewherein it is not assumed that the projector 5 is used placed on a desk.Also, the suspension position adjustment mechanism 1 included in theprojector ceiling mounting apparatus 2 of the embodiment has aconfiguration such that it is installed on a wall surface 900 (refer toFIGS. 4A and 4B), and the projector 5 is suspended from the wall surface900 with the suspension position adjustment mechanism 1.

FIG. 2 is a plan view schematically showing an optical system of theprojector. Referring to FIG. 2, a brief description will be given of aconfiguration and operation of the optical system of the projector 5.

The optical unit 4 of the projector 5 forms an image light, based on theimage signal, by being controlled by the controller. The optical unit 4includes the light source (light source lamp 41), an illuminationoptical device 42, a color separation optical device 43, a relay opticaldevice 44, an optical device 45, an optical part housing 46, and theprojection optical device 47.

The light source lamp 41 is such that a luminous flux is reflected off areflector 412 by a light emission of a light emitting tube 411, andemitted to an illumination region. The light source lamp 41 includes thelight emitting tube 411 and reflector 412. The illumination opticaldevice 42 is one for equalizing the illuminance of the luminous flux,emitted from the light source lamp 41, in a plane perpendicular to anillumination optical axis A. The illumination optical device 42 includeslens arrays 421 and 422, a polarization conversion element 424, and asuperimposing lens 425. Also, the illumination optical device 42includes three field lenses 426. The field lenses 426 being disposedupstream of the three corresponding liquid crystal panels 451 of theoptical device 45, each of the field lenses 426 converts each partialluminous flux emitted from the lens array 422 into a luminous fluxparallel to the central axis of each field lens 426.

The color separation optical device 43 separates illumination luminousfluxes from the illumination optical device 42 into three color lights,red (R), green (G), and blue (B), and guides them to the three liquidcrystal panels 451. The color separation optical device 43 includesdichroic mirrors 431 and 432, and a reflecting mirror 433. As theoptical path length of a color light (in the embodiment, the red colorlight) separated by the color separation optical device 43 is greaterthan the optical path length of the other color lights, the relayoptical device 44 prevents a decrease in light use efficiency due to adivergence of light, or the like, and guides the color light to a liquidcrystal panel 451 (in the embodiment, a liquid crystal panel 451R). Therelay optical device 44 includes an incident side lens 441, a relay lens443, and reflecting mirrors 442 and 444.

The optical device 45, based on the image signal, modulates each colorlight falling incident on each corresponding liquid crystal panel 451,forming an image light for each color light, and subsequently, causesthe image lights to be synthesized by a color synthesis optical device.The optical device 45 includes the three liquid crystal panels 451 asthe light modulation elements, three incident side polarizing plates452, three emitting side polarizing plates 453, and a cross dichroicprism 454 as the color synthesis optical device. Also, the three liquidcrystal panels 451 are configured of the red color light liquid crystalpanel 451R as a red color light modulation element, a green color lightliquid crystal panel 451G as a green color light modulation element, anda blue color light liquid crystal panel 451B as a blue color lightmodulation element.

The projection optical device 47 is configured including a projectionlens 471 and a reflecting mirror 472 having a curved surface. Theprojection optical device 47 is such that an image light synthesized bythe optical device 45 (color synthesis optical device) is magnified bythe projection lens 471, reflected by the reflecting mirror 472, andprojected magnified onto the screen S. A detailed description of eachheretofore described optical device 41 to 45 and 47 is omitted.

FIG. 3 is a perspective view showing a condition in which the projectoris fixed to the projector suspension device. FIGS. 4A and 4B aredrawings showing a condition in which the projector is fixed to theprojector suspension device, and a projection is done onto the screen,where FIG. 4A is a front view, and FIG. 4B a side view. FIG. 3 shows acondition of the suspension position adjustment mechanism 1 of theprojector suspension device 2 seen from above. A description will begiven, referring to FIGS. 3, 4A, and 4B, of a projection of theprojector 5.

In the drawings (FIGS. 3, 4A, and 4B, and drawings to be describedhereafter), when describing a direction of movement, or the like, of thesuspension position adjustment mechanism 1, the normal direction of thewall surface 900 is taken to be a front-back direction, a directiontoward the wall surface 900 a front direction, and a direction away fromthe wall surface 900 a back direction. Also, a direction ofgravitational force perpendicular to the front-back direction andparallel to the wall surface 900 is taken to be an up-down direction, adirection opposing the gravitational force an up direction, and adirection the same as that of the gravitational force a down direction.Then, a direction perpendicular to the front-back direction anddirection of gravitational force (up-down direction) is taken to be aleft-right direction, the left side when facing the wall surface 900 aleft direction, and the right side a right direction.

The projector suspension device 2 of the embodiment includes thesuspension position adjustment mechanism 1 (hereafter abbreviated as theposition adjustment mechanism 1). Also, the projector suspension device2 is configured including, apart from the position adjustment mechanism1, a cover member (not shown) covering the outer periphery of theposition adjustment mechanism 1, and the like.

The position adjustment mechanism 1 is a mechanism (an apparatus) withwhich the projector 5 is fixed to an upper portion of the wall surface900, and installed suspended therefrom, as shown in FIG. 4B. Also, theprojector 5 is fixed with the bottom surface 5 b side in the updirection, and with the back surface 5 c side in the front direction (inthe direction of the wall surface 900). Then, the projector 5 projectsthe projection image via the projection window 513 toward the screen Sinstalled in a down direction portion of the wall surface 900 on whichthe position adjustment mechanism 1 is installed. An impression of theimage light of the projection image projected from the projector 5 isshown by the two-dot chain lines in FIGS. 4A and 4B. As shown in FIG.4B, the projector 5 of the embodiment is configured as a so-called shortfocus projector which causes an image magnification projection onto thescreen S at a short distance.

The position adjustment mechanism 1 is an apparatus which, by adjustingthe position of the projector 5 when the projector 5 projects theprojection image, carries out an adjustment of a position of theprojector 5 with respect to a projection position C of the projectedprojection image in such a way that the projection position C is alignedwith a projection region B of the screen S.

As shown in FIG. 3, the position adjustment mechanism 1 is configuredincluding a base substrate 10, a slide receiving substrate 15, a firstslide substrate 20, a second slide substrate 25, a first holding plate30, a pivotal support plate 35, a second holding plate 50, a springfixing plate 55, a third slide substrate 60, a projector fixingsubstrate 65, and the like. Then, the position adjustment mechanism 1 iscapable of six direction adjustments. Specifically, the positionadjustment mechanism 1 is capable of a front-back adjustment, aleft-right adjustment, an up-down adjustment, a horizontal rolladjustment, an up-down tilt adjustment, and a horizontal rotationadjustment.

Also, as a method of adjustment with the position adjustment mechanism1, firstly, the projector 5 is fixed with the projection position C ofthe projector 5 roughly aligned with the projection region B of thescreen S by carrying out the front-back adjustment, left-rightadjustment, and up-down adjustment. Next, a fine adjustment is carriedout by carrying out the horizontal roll adjustment, up-down tiltadjustment, and horizontal rotation adjustment, thus accurately aligningthe projection position C with the projection region B. FIGS. 4A and 4Bshow a condition in which the projection region B of the screen S andthe projection position C of the projector 5 are misaligned.

The up-down adjustment, being an adjustment carried out in the up-downdirection, is carried out, in the embodiment, by an adjustment of theslide receiving substrate 15 with respect to the base substrate 10. Thefront-back adjustment, being an adjustment carried out in the front-backdirection, is carried out, in the embodiment, by an adjustment of thefirst slide substrate 20 with respect to the slide receiving substrate15, and an adjustment of the second slide substrate 25 with respect tothe first slide substrate 20. The left-right adjustment, being anadjustment carried out in the left-right direction, is carried out, inthe embodiment, by an adjustment of the projector fixing substrate 65with respect to the third slide substrate 60.

The horizontal roll adjustment, being an adjustment of a left-rightdirection tilt with respect to the horizontal plane, is carried out, inthe embodiment, by a tilt adjustment (an angle adjustment) of the springfixing plate 55 with respect to the second slide substrate 25 by turninga first dial 71. The position adjustment mechanism 1 includes the firstdial 71, a first screw member 72, a first spring member 73, a firstturning pivot member 74, and the like, as components of a main portionfor carrying out the horizontal roll adjustment. A horizontal rollmechanism section 70 is configured of the heretofore described componentmembers for carrying out the horizontal roll adjustment, including thesecond slide substrate 25 and spring fixing plate 55.

The up-down tilt adjustment, being an adjustment of a front-backdirection tilt with respect to the horizontal plane, is carried out, inthe embodiment, by a tilt adjustment (an angle adjustment) of the springfixing plate 55 with respect to the second slide substrate 25 by turninga second dial 81. The position adjustment mechanism 1 includes thesecond dial 81, a second screw member 82, a second spring member 83, asecond turning pivot member 84, and the like, as components of a mainportion for carrying out the up-down tilt adjustment. An up-down tiltmechanism section 80 is configured of the heretofore described componentmembers for carrying out the up-down tilt adjustment, including thesecond slide substrate 25 and spring fixing plate 55.

The horizontal rotation adjustment, being an adjustment of a paralleldirection tilt (rotation) with respect to the horizontal plane, iscarried out, in the embodiment, by a rotation adjustment (an angleadjustment) of the third slide substrate 60 with respect to the springfixing plate 55 by turning a third dial 91. The position adjustmentmechanism 1 includes the third dial 91, a third screw member 92, a thirdspring member 93, a third turning pivot member 94, a third pivot guidemember 95, a pivoting limit member 96, a pivoting limit guide member 97,and the like, as components of a main portion for carrying out thehorizontal rotation adjustment. A horizontal rotation mechanism section90 is configured of the heretofore described component members forcarrying out the horizontal rotation adjustment, including the springfixing plate 55 and third slide substrate 60.

FIGS. 5 and 6 are assembly diagrams of the suspension positionadjustment mechanism. Specifically, FIG. 5 is an assembly diagram of thebase substrate 10 to the second slide substrate 25. FIG. 6 is anassembly diagram of the first holding plate 30 to the projector fixingsubstrate 65. Referring to FIGS. 5 and 6, a description will be given ofa configuration, an assembling method, and an adjustment method, of theposition adjustment mechanism 1. FIGS. 3, 4A, and 4B will be referred toas appropriate.

A description will be given of configurations of the base substrate 10,slide receiving substrate 15, and first slide substrate 20 whichconfigure the position adjustment mechanism 1.

The base substrate 10 is a member which fixes the position adjustmentmechanism 1 to the wall surface 900. The base substrate 10 is formed ofan approximately rectangular base substrate main body 101. The basesubstrate main body 101 includes in the center thereof erect portions102 erected parallel to the up-down direction and facing in the backdirection. Also, the base substrate main body 101 includes at the outerperipheral edge thereof erect portions 104 erected in the backdirection, thus securing the rigidity of the base substrate 10. Also,the base substrate main body 101 includes a plurality of screw throughholes 105 used in fixing the base substrate 10 to the wall surface 900.

Also, a cylindrically formed hook support member 106 which, being fixedto the two erect portions 102, is for pivotably hooking thereover hookportions 163 of the slide receiving substrate 15 is fixed in the upperportions of the erect portions 102. Also, slide receiving substratefixing holes 103, which are threadedly engaged with fixing screws 751for clamping and fixing slot portions 164 of the slide receivingsubstrate 15, are formed, opposed to each other, in the two erectportions 102.

The slide receiving substrate 15 is configured of a substrate fixingportion 16 fixed to the base substrate 10, and a slide receiving portion18 which receives and fixes the first slide substrate 20. The slidereceiving substrate 15 is configured so that one end of the slidereceiving portion 18 is fixed fitted in a left-right direction portionof the approximate center of the substrate fixing portion 16. With thisconfiguration, the slide receiving portion 18 is configured so that itis fixed approximately perpendicular to the substrate fixing portion 16.

The substrate fixing portion 16, being formed of an approximatelyrectangular substrate fixing portion main body 161, includes bendportions 162 formed by bending both left and right end portions thereofat right angles in the front direction. In the upper portions of thebend portions 162, the hook portions 163, cut away with a diameter whichcan be hooked over the diameter of the hook support member 106 of thebase substrate 10, are formed, opposed to each other, in the two bendportions 162. Also, in the lower portions of the bend portions 162, theslot portions 164 are formed, opposed to each other, in the two bendportions 162.

The slide receiving portion 18, being formed of an approximatelyrectangular slide receiving portion main body 181, includes bendportions 182 formed by curving both left and right end portions thereofin the up direction, and then bending them inward in such away as to beparallel to the surface of the slide receiving portion main body 181.Slide slots 183 extending in the front-back direction are formed in thetwo bend portions 182.

The first slide substrate 20 is a member which is slid and fixed in theslide receiving substrate 15, and also, in which the second slidesubstrate 25 is slid and fixed. The first slide substrate 20, beingformed of an approximately rectangular first slide substrate main body201, includes bend portions 202 formed by curving both left and rightend portions thereof in the up direction, and then bending them inwardin such a way as to be parallel to the surface of the first slidesubstrate main body 201. Slide slots 203 extending in the front-backdirection are formed in the two bend portions 202. Also, slide fixingholes 204 for inserting and sliding the first slide substrate 20 intothe slide receiving portion 18 of the slide receiving substrate 15, andfixing the first slide substrate 20 in the slide receiving portion 18,are formed in the front direction portions of the two bend portions 202.

Referring to FIG. 5, a description will be given of a method ofassembling (fixing) the position adjustment mechanism 1.

A description will be given of an outline flow of the method ofassembling the position adjustment mechanism 1 of the embodiment.

Firstly, the component members up to the first slide substrate 20 areassembled on the base substrate 10 installed on the wall surface 900.Next, the second slide substrate 25 to the pivoting plate 35 areassembled. Next, the second holding plate 50 to the projector fixingsubstrate 65 are assembled.

Subsequently, a position adjustment mechanism 1 section into which thesecond holding plate 50 to the projector fixing substrate 65 have beenassembled is assembled on a position adjustment mechanism 1 section intowhich the second slide substrate 25 to the pivoting plate 35 have beenassembled. Subsequently, the projector 5 is fixed to the projectorfixing substrate 65. Finally, a position adjustment mechanism 1 sectionfrom the second slide substrate 25 to the projector fixing substrate 65to which the projector 5 has been fixed is assembled on the first slidesubstrate 20 assembled on the wall surface 900. With the aboveassembling method, it is possible to assemble the position adjustmentmechanism 1, and suspend the projector 5 from the position adjustmentmechanism 1 fixed to the wall surface 900.

A description will be given of a method of assembling the base substrate10, which is the first member to be fixed to the wall surface 900, theslide receiving substrate 15, and the first slide substrate 20.

A description will be given of a method of assembling (fixing) the basesubstrate 10 on (to) the wall surface 900. The base substrate 10 isfixed by inserting fixing screws (not shown) inserted through washers(not shown) through the screw through holes 105, and screwing them intothe wall surface 900.

A description will be given of a method of fixing the base substrate 10and slide receiving substrate 15. Firstly, the hook portions 163 of theslide receiving substrate 15 (substrate fixing portion 16) are hookedover the hook support member 106 (specifically, portions of the hooksupport member 106 extending from the erect portions 102) of the basesubstrate 10. Next, the fixing screws 751 inserted through washers 781are inserted through the slot portions 164, and threadedly engaged withthe slide receiving substrate fixing holes 103 of the base substrate 10,thus holding the bend portions 162 on the erect portions 102, andthereby fixing the base substrate 10 and slide receiving substrate 15.

A description will be given of a method of fixing the slide receivingsubstrate 15 and first slide substrate 20. Firstly, the first slidesubstrate 20 is inserted into the slide receiving portion 18 of theslide receiving substrate 15. Next, fixing screws 752 inserted throughwashers 782 are inserted through the slide slots 183, and threadedlyengaged with the slide fixing holes 204 of the first slide substrate 20,thus holding the bend portions 182 on the bend portion 202, and therebyfixing the slide receiving substrate 15 and first slide substrate 20.

By the above methods, it is possible to assemble the slide receivingsubstrate 15 and first slide substrate 20 on the base substrate 10installed on the wall surface 900.

Next, referring to FIGS. 5 and 6, a description will be given ofconfigurations of the second slide substrate 25 to the pivotal supportplate 35 which configure the position adjustment mechanism 1.

The second slide substrate 25 is a member which is slid and fixed in thefirst slide substrate 20. Also, the second slide substrate 25 is amember for carrying out the horizontal roll adjustment and up-down tiltadjustment for the fine adjustment. The second slide substrate 25, beingformed of an approximately rectangular second slide substrate main body251, includes bend portions 252 formed by curving both left and rightend portions thereof in the up direction, and then bending them inwardin such a way as to be parallel to the surface of the second slidesubstrate main body 251. Slide fixing holes 253 for inserting, sliding,and fixing the second slide substrate 25 in the first slide substrate 20are formed in the front direction portions of the two bend portions 252.

The second slide substrate 25 includes a first screw relief hole 254,formed for the horizontal roll adjustment, in a back direction portionof the second slide substrate main body 251. Also, in the same way, itincludes a second screw relief hole 255 formed for the up-down tiltadjustment. Then, the second slide substrate 25 includes first holdingplate fixing holes 256 which, being deburred and threaded, are forfixing the first holding plate 30 to the under surface of the secondslide substrate main body 251.

The first holding plate 30 is a member which holds the first turningpivot member 74 which acts as a pivot for carrying out the horizontalroll adjustment. Also, it also holds the pivotal support plate 35, to bedescribed hereafter. The first holding plate 30, being formed of anapproximately rectangular first holding plate main body 301, includeserect portions 302 erected vertically in the down direction from thefront-back direction edges. First pivot through holes 303 through whichthe first turning pivot member 74 is pivotably inserted are formed inthe two erect portions 302. Also, a screw through hole 304 which, aftercarrying out the horizontal roll adjustment, is used for furtherreinforcing the fixation of the adjusted position is formed in a downdirection portion of the back direction erect portion 302. Also, screwthrough holes 305 corresponding to the first holding plate fixing holes256 of the second slide substrate 25 are formed in the first holdingplate main body 301.

The pivotal support plate 35 is a member which links the first holdingplate 30 and second holding plate 50. The pivotal support plate 35 holds(pivotally supports) the first turning pivot member 74 and the secondturning pivot member 84 to be described hereafter. The pivotal supportplate 35 is formed of a pivotal support plate main body 351 formed in anapproximately octagonal cylindrical shape. First pivot through holes352, through which the first turning pivot member 74 is inserted, areformed in opposed surfaces of the pivotal support plate main body 351.Also, second pivot through holes 354, through which the second turningpivot member 84 is inserted, are formed opposed in surfaces of thepivotal support plate main body 351 perpendicular to the surfaces inwhich the first pivot through holes 352 are formed.

Also, a fixing hole 353 is formed in a lower position of the backdirection surface of the pivotal support plate main body 351 in whichthe first pivot through holes 352 are formed. Also, a fixing hole 355 isformed in an upper position of the right direction surface of thepivotal support plate main body 351 in which the second pivot throughholes 354 are formed.

Next, a description will be given of a method of assembling (fixing) thesecond slide substrate 25 to the pivotal support plate 35.

A description will be given of a method of fixing the second slidesubstrate 25 and first holding plate 30. The screw through holes 305 ofthe first holding plate 30 are caused to correspond to the first holdingplate fixing holes 256 of the second slide substrate 25, after whichfixing screws 755 inserted through washers 788 are inserted through thescrew through holes 305, and threaded engaged with the first holdingplate fixing holes 256, thus holding the first holding plate main body301 on the second slide substrate main body 251, and thereby fixing thesecond slide substrate 25 and first holding plate 30.

A description will be given of a method of fixing the pivotal supportplate 35 and first holding plate 30. The pivotal support plate 35 isdisposed between the opposed erect portions 302 of the first holdingplate 30. Then, the first pivot through holes 352 of the pivotal supportplate 35 are positioned caused to correspond to the first pivot throughholes 303 of the first holding plate 30. At this time, the fixing hole353 of the pivotal support plate 35 is positioned caused to correspondto the screw through hole 304 of the first holding plate 30.

Next, the first turning pivot member 74 inserted through a washer 786 isinserted through the first pivot through holes 303 of the first holdingplate 30, and the first pivot through holes 352 of the pivotal supportplate 35, and protruded from the front direction erect portion 302 ofthe first holding plate 30. A screw-threaded portion is formed on theleading end portion of the first turning pivot member 74 protruded fromthe erect portion 302, and an unshown nut is threadedly engaged with thescrew-threaded portion. Because of this, the pivotal support plate 35 ispivotably fixed to the first holding plate 30 by the first turning pivotmember 74. Also, in this condition, a fixing screw 754 inserted througha washer 787 is inserted through the screw through hole 304 of the firstholding plate 30, and temporarily fixed in the fixing hole 353 of thepivotal support plate 35.

Next, referring to FIGS. 5 and 6, a description will be given ofconfigurations of the second holding plate 50 to the projector fixingsubstrate 65 which configure the position adjustment mechanism 1.

The second holding plate 50 is a member which holds the second turningpivot member 84 which acts as a pivot for carrying out the up-down tiltadjustment. Also, it also holds the pivotal support plate 35. The secondholding plate 50, being formed of an approximately rectangular secondholding plate main body 501, includes erect portions 502 erectedvertically in the up direction from the left-right direction edges ofthe second holding plate 50. Second pivot through holes 503 throughwhich the second turning pivot member 84 is pivotably inserted areformed in the two erect portions 502. Also, a screw through hole 504which, after carrying out the up-down tilt adjustment, is used forfurther reinforcing the fixation of the adjusted position is formed inan up direction portion of the right direction erect portion 502. Also,a screw through hole 505 corresponding to a second holding plate fixinghole 558, to be described hereafter, of the spring fixing plate 55 isformed in the second holding plate main body 501.

The spring fixing plate 55 is a member for, as well as fixing the secondholding plate 50, carrying out the horizontal roll adjustment, up-downtilt adjustment, and horizontal rotation adjustment for the fineadjustment. The spring fixing plate 55, being formed of an approximatelyrectangular spring fixing plate main body 551, includes at the backdirection edge thereof an erect portion 552 erected vertically in the updirection. The erect portion 552 includes therein a third screw memberfixing hole 553 which, being protruded in the back direction, isdeburred and threaded. Also, the spring fixing plate main body 551includes therein a first screw member fixing hole 556 and second screwmember fixing hole 557 which, being protruded in the up direction, aredeburred and threaded.

Also, a third pivot guide member hole 554, which pivotably holds thethird turning pivot member 94 (specifically, the third pivot guidemember 95) acting as a pivot for carrying out the horizontal rotationadjustment, is formed in the spring fixing plate main body 551. Then,the spring fixing plate main body 551 includes therein a limit slot 555which, being formed with the third pivot guide member hole 554 as thecenter, limits a rotation adjustment range when carrying out thehorizontal rotation adjustment. Also, second holding plate fixing holes558 for fixing the second holding plate 50 are formed in the springfixing plate main body 551.

The third slide substrate 60 is a member for carrying out the horizontalrotation adjustment for the fine adjustment. Also, the third slidesubstrate 60 is a member which carries out an adjustment in theleft-right direction (the left-right adjustment) of the projector fixingsubstrate 65, to be described hereafter. The third slide substrate 60,being formed of an approximately rectangular third slide substrate mainbody 601, includes at the back direction edge thereof an erect portion602 extended therefrom and erected vertically in the up direction. Theerect portion 602 includes therein a third screw member relief hole 603elongated in the left-right direction.

The third slide substrate main body 601 includes at an edge portionthereof going away from the erect portion 602 an extending portion 604which erects vertically in the down direction, and furthermore, extendsat right angles in the back direction in such a way as to be parallel tothe third slide substrate main body 601. The extending portion 604includes therein slide fixing holes 605 for fixing the third slidesubstrate 60 to the projector fixing substrate 65 after carrying out theleft-right adjustment (a slide adjustment) of the projector fixingsubstrate 65.

Also, the third slide substrate main body 601 includes at the frontdirection edge thereof an extending portion 606 which erects verticallyin the down direction, and furthermore, extends at right angles in thefront direction in such a way as to be parallel to the third slidesubstrate main body 601, and so as to be opposed to the extendingportion 604. Also, the third slide substrate main body 601 includestherein a third pivot member fixing hole 607, in which the third turningpivot member 94 is fixed, and a pivoting limit member fixing hole 608,in which the pivoting limit member 96 is fixed.

The projector fixing substrate 65 is a member to which the projector 5is fixed. The projector fixing substrate 65 is formed of anapproximately rectangular fixing substrate main body 651. Then, thefixing substrate main body 651 includes in the center thereof an opposedslide receiving portion 652 and slide receiving portion 653 which areerected in the up direction parallel to the left-right direction, andfurthermore, extended toward the center parallel to the fixing substratemain body 651. The back direction slide receiving portion 652 includestherein a slide slot 654 formed parallel to the left-right direction.Also, screw through holes 655 are formed in the fixing substrate mainbody 651 so as to correspond to the four fixing legs 514 of theprojector 5.

Next, a description will be given of a method of assembling (fixing) thesecond holding plate 50 to the projector fixing substrate 65.

A description will be given of a method of fixing the second holdingplate 50 and spring fixing plate 55. The screw through holes 505 of thesecond holding plate 50 are caused to correspond to the second holdingplate fixing holes 558 of the spring fixing plate 55, after which thefixing screws 756 inserted through washers 789 are inserted through thescrew through holes 505, and threadedly engaged with the second holdingplate fixing holes 558, thus holding the second holding plate main body501 on the spring fixing plate main body 551, and thereby fixing thesecond holding plate 50 and spring fixing plate 55.

Next, the first screw member 72, second screw member 82, and third screwmember 92 are fixed in the spring fixing plate 55. Specifically, thefirst screw member 72 inserted through a washer 795 is threadedlyengaged with the first screw member fixing hole 556 of the spring fixingplate main body 551 from the under surface of the spring fixing platemain body 551, and the first screw member 72 is tightened and fixeduntil a head 72 a thereof abuts against the under surface of the springfixing plate main body 551, and does not rotate any longer. In the sameway, the second screw member 82 inserted through a washer 796 isthreadedly engaged with the second screw member fixing hole 557 of thespring fixing plate main body 551 from the under surface of the springfixing plate main body 551, and fixed in the same way. Next, the thirdscrew member 92 inserted through a washer 794 is threadedly engaged withthe third screw member fixing hole 553 of the erect portion 552 from thefront direction of the erect portion 552, and tightened and fixed untila head 92 a of the third screw member 92 abuts against the frontdirection surface of the erect portion 552, and does not rotate anylonger.

Next, the third spring member 93 is fitted on the threaded portion ofthe third screw member 92 protruded in the back direction from the erectportion 552 of the spring fixing plate 55. In this condition, theleading end of the threaded portion of the third screw member 92 isinserted through the third screw member relief hole 603 from the frontdirection of the erect portion 602 of the third slide substrate 60, andmoved in the back direction. The movement is carried out against apressing force generated by the third spring member 93 being moved whilebeing sandwiched between the erect portion 552 of the spring fixingplate 55 and the erect portion 602 of the third slide substrate 60 bythe third spring member 93 abutting against the erect portion 602 of thethird slide substrate 60. Then, the third pivot guide member hole 554and limit slot 555 of the spring fixing plate 55 are aligned with thepositions of the corresponding third pivot member fixing hole 607 andpivoting limit member fixing hole 608.

Next, a sliding portion 95 a formed with a diameter smaller than thediameter of the outer shape of the third pivot guide member 95 isinserted into the third pivot guide member hole 554 from the updirection. Also, a sliding portion 97 a formed with a diameter smallerthan the diameter of the outer shape of the pivoting limit guide member97 is inserted into the limit slot 555. Next, the third turning pivotmember 94 is inserted through the third pivot guide member 95 from theup direction, and threadedly engaged with and fixed in the third pivotmember fixing hole 607 of the third slide substrate 60. In the same way,the pivoting limit member 96 is inserted through the pivoting limitguide member 97 from the up direction, and threadedly engaged with andfixed in the pivoting limit member fixing hole 608 of the third slidesubstrate 60.

By this assembly, the spring fixing plate 55, to which the secondholding plate 50 is fixed, and the third slide substrate 60 areintegrated.

Next, the third slide substrate 60 is fixed to the projector fixingsubstrate 65. Specifically, firstly, the extending portions 604 and 606of the third slide substrate 60 are inserted inside the correspondingslide receiving portions 652 and 653 of the projector fixing substrate65. Next, the fixing screws 758 inserted through washers 797 areinserted from the up direction of the slide slot 654 of the slidereceiving portion 652, and threadedly engaged with the slide fixingholes 605 of the extending portion 604, thereby fixing the third slidesubstrate 60 to the projector fixing substrate 65.

By this assembly, the spring fixing plate 55 to which the second holdingplate 50 is fixed, the third slide substrate 60, and the projectorfixing substrate 65 are integrated.

Next, a description will be given of a method of assembling (fixing) theposition adjustment mechanism 1 section, into which the second holdingplate 50 to the projector fixing substrate 65 has been assembled, on theposition adjustment mechanism 1 section into which the second slidesubstrate 25 to the pivotal support plate 35 have been assembled.

Firstly, the first spring member 73 and a washer 792 are fitted on thethreaded portion of the first screw member 72 protruded in the upportion from the spring fixing plate main body 551 of the spring fixingplate 55. In the same way, the second spring member 83 and a washer 793are fitted on the threaded portion of the second screw member 82protruded in the up direction from the spring fixing plate main body 551of the spring fixing plate 55.

In this condition, next, the leading end of the threaded portion of thefirst screw member 72 is inserted through the first screw member reliefhole 254 of the second slide substrate 25 from the down direction. Also,in the same way, the leading end of the threaded portion of the secondscrew member 82 is inserted through the second screw member relief hole255 of the second slide substrate 25 from the down direction.

At this time, the first spring member 73 and second spring member 83 aremoved in the up direction in such a way that the pivotal support plate35 to which the first holding plate 30 is fixed is positioned betweenthe erect portions 502 of the second holding plate 50 fixed to thespring fixing plate 55. The movement is carried out against a pressingforce generated by the first spring member 73 and second spring member83 being moved sandwiched between the spring fixing plate 55 and secondslide substrate 25 by the first spring member 73 and second springmember 83 abutting against the second slide substrate 25 (specifically,across the washers 792 and 793).

By this movement, the second pivot through holes 503 of the secondholding plate 50 are positioned caused to correspond to the second pivotthrough holes 354 of the pivotal support plate 35. Also, the screwthrough hole 504 of the second holding plate 50 is positioned caused tocorrespond to the fixing hole 355 of the pivotal support plate 35.

Next, the second turning pivot member 84 inserted through a washer 791is inserted through the second pivot through holes 503 of the secondholding plate 50 and the second pivot through holes 354 of the pivotalsupport plate 35, and protruded from the left direction erect portion502 of the second holding plate 50. A screw-threaded portion is formedat the leading end portion of the second turning pivot member 84protruded from the erect portion 502, and an unshown nut is threadedlyengaged with the screw-threaded portion. Because of this, the pivotalsupport plate 35 is pivotably fixed to the second holding plate 50 bythe second turning pivot member 84. Also, in this condition, the fixingscrew 757 inserted through a washer 790 is inserted through the screwthrough hole 504 of the second holding plate 50, and temporarily fixedin the fixing hole 355 of the pivotal support plate 35.

In this case, a configuration is attained wherein the first turningpivot member 74 and second turning pivot member 84 are pivotallysupported by the pivot support plate 35 so as to be perpendicular toeach other with space therebetween narrowed in the up-down direction.With this configuration, the miniaturization of the pivotal supportplate 35, first holding plate 30, and second holding plate 50 isachieved.

By this assembly, the position adjustment mechanism 1 has integratedthereinto the second slide substrate 25, first holding plate 30, pivotalsupport plate 35, second holding plate 50, spring fixing plate 55, thirdslide substrate 60, and projector fixing substrate 65.

Next, the first dial 71, second dial 81, and third dial 91 areassembled. Specifically, by the heretofore described assembly, a washer784 is fitted from the up direction on the first screw member 72protruded in the up direction from the first screw member relief hole254 of the second slide substrate 25. Next, the screw-threaded firstdial 71 is threadedly engaged with the protruded first screw member 72.In the same way, a washer 785 is fitted from the up direction on thesecond screw member 82 protruded in the up direction from the secondscrew member relief hole 255, and the screw-threaded second dial 81 isthreadedly engaged with the second screw member 82. Also, in the sameway, a washer 798 is fitted from the back direction on the third screwmember 92 protruded in the back direction from the third screw memberrelief hole 603 included in the erect portion 602 of the third slidesubstrate 60, and the screw-threaded third dial 91 is threadedly engagedwith the third screw member 92.

Next, a description will be given of a method of fixing the projector 5to the projector fixing substrate 65. Specifically, the four fixing legs514 of the projector 5 are caused to correspond to the screw throughholes 655 of the projector fixing substrate 65, and fixing screws 759inserted through washers 799 are inserted through the screw throughholes 655, and threadedly engaged with the fixing legs 514 of theprojector 5, thereby fixing the projector 5 to the projector fixingsubstrate 65.

Because of this, with the position adjustment mechanism 1, the assemblyof the second slide substrate 25 to the projector fixing substrate 65 isfinished, and the projector 5 attains a fixed condition.

Next, a description will be given of a method of assembling a positionadjustment mechanism 1 section from the second slide substrate 25 to theprojector fixing substrate 65, to which the projector 5 is fixed, on thefirst slide substrate 20 assembled and fixed to the wall surface 900.Specifically, the second slide substrate 25 to which the componentmembers up to the projector 5 are fixed is fixed to the first slidesubstrate 20.

A description will be given of a method of fixing the second slidesubstrate 25 and first slide substrate 20. Firstly, the second slidesubstrate 25 is inserted into the first slide substrate 20. Next, fixingscrews 753 inserted through washers 783 are inserted through the slideslots 203 of the first slide substrate 20, and threadedly engaged withthe slide fixing holes 253 of the second slide substrate 25, and thebend portions 202 are held on the bend portions 252, thereby fixing thesecond slide substrate 25 and first slide substrate 20. When fixing thesecond slide substrate 25 in the first slide substrate 20, as the slideslots 203 of the first slide substrate 20 are formed closer to thecenter side than the slide slots 183 of the slide receiving substrate15, it is possible to fix the second slide substrate 25 and first slidesubstrate 20 without any interference with each other.

By the heretofore described assembling method, the position adjustmentmechanism 1 is assembled as shown in FIG. 3, and it is possible to fixthe position adjustment mechanism 1, from which the projector 5 issuspended, to the wall surface 900.

Hereafter, a description will be given of position adjustments (theup-down adjustment, front-back adjustment, and left-right adjustment) ofthe position adjustment mechanism 1.

The position adjustments are carried out by operating the projector 5,projecting the projection image (a projection light only is alsoacceptable) onto the screen S, and confirming the projection position Cof the image projected onto the projection region B of the screen S.Firstly, an adjustment of roughly aligning the projection position Cwith the projection region B is carried out by carrying out the up-downadjustment, front-back adjustment, and left-right adjustment.

Firstly, a description will be given of the up-down adjustment of theposition adjustment mechanism 1.

The up-down adjustment of the position adjustment mechanism 1 is carriedout by an adjustment of the slide receiving substrate 15 with respect tothe base substrate 10. Specifically, the up-down adjustment is carriedout by firstly loosening the fixation (threaded engagement) by thefixing screws 751 and, after that, pivoting the slide receivingsubstrate 15 around the hook support member 106. The up-down adjustmentin the embodiment is the same as a tilt adjustment which adjusts aninclination angle in the up-down direction. Also, after the up-downadjustment, the slide receiving substrate 15 is fixed to the basesubstrate 10 by tightening the fixing screws 751.

Next, a description will be given of the front-back adjustment of theposition adjustment mechanism 1.

The front-back adjustment of the position adjustment mechanism 1 iscarried out by an adjustment of the first slide substrate 20 withrespect to the slide receiving substrate 15, and an adjustment of thesecond slide substrate 25 with respect to the first slide substrate 20.

A description will be given of the adjustment of the first slidesubstrate 20 with respect to the slide receiving substrate 15. Theadjustment is carried out by firstly loosening the fixation (threadedengagement) by the fixing screws 752 and, after that, sliding the firstslide substrate 20 into the slide receiving portion 18 of the slidereceiving substrate 15. Also, after the adjustment, the first slidesubstrate 20 is fixed in the slide receiving substrate 15 by tighteningthe fixing screws 752.

Next, a description will be given of the adjustment of the second slidesubstrate 25 with respect to the first slide substrate 20. Theadjustment is carried out by firstly loosening the fixation (threadedengagement) by the fixing screws 753 and, after that, sliding the secondslide substrate 25 into the first slide substrate 20. Also, after theadjustment, the second slide substrate 25 is fixed in the first slidesubstrate 20 by tightening the fixing screws 753. In this way, in theembodiment, two stages of slide are carried out by using the first slidesubstrate 20 and second slide substrate 25, and it is possible toincrease the amount of adjustment in the front-back direction.

Next, a description will be given of the left-right adjustment of theposition adjustment mechanism 1.

The left-right adjustment of the position adjustment mechanism 1 iscarried out by an adjustment of the projector fixing substrate 65 withrespect to the third slide substrate 60. Specifically, the left-rightadjustment is carried out by firstly loosening the fixation (threadedengagement) by the fixing screws 758 and, after that, sliding theprojector fixing substrate 65 fixing the projector 5 in the left-rightdirection with respect to the extending portions 604 and 606 of thethird slide substrate 60. Also, after the left-right adjustment, theprojector fixing substrate 65 is fixed to the third slide substrate 60by tightening the fixing screws 758.

As heretofore described, by carrying out the up-down adjustment,front-back adjustment, and left-right adjustment, it is possible toroughly align the projection position C with the projection region B.

Hereafter, a description will be given of position adjustments (thehorizontal roll adjustment, up-down tilt adjustment, and horizontalrotation adjustment) of the position adjustment mechanism 1.

As heretofore described, the horizontal roll adjustment, up-down tiltadjustment, and horizontal rotation adjustment are adjustments carriedout after carrying out the up-down adjustment, front-back adjustment,and left-right adjustment, and roughly aligning the projection positionC with the projection region B. Fine adjustments are carried out bycarrying out the horizontal roll adjustment, up-down tilt adjustment,and horizontal rotation adjustment, thus making an adjustment in such away that the projection position C is accurately aligned with theprojection region B.

Firstly, a description will be given of the horizontal roll adjustmentof the position adjustment mechanism 1.

FIG. 7 is a drawing of a condition in which the horizontal rolladjustment is carried out, seen from the back direction. FIG. 7 showsthe second slide substrate 25 to the projector fixing substrate 65 and,for convenience of description, others are omitted.

The horizontal roll adjustment is carried out using the horizontal rollmechanism section 70. Specifically, the angle formed by the springfixing plate 55 with respect to the second slide substrate 25 isadjusted by turning the first dial 71 shown in FIGS. 3 and 7.

As shown in FIG. 7, by turning the first dial 71 acting as a turningmember in the clockwise direction, the threaded engagement thereof withthe first screw member 72 acting as a screw member progresses, and thefirst dial 71 and the head 72 a of the first screw member 72 comecloser. In accordance with this, the spring fixing plate 55 rotates inthe direction of the second slide substrate 25 with the first turningpivot member 74, which is disposed perpendicular to the axial directionof the first screw member 72 and guided by the first holding plate 30and pivotal support plate 35, as the central axis. Because of this, itis possible to adjust the angle formed by the second slide substrate 25and spring fixing plate 55. At this time, the first spring member 73acting as a pressing member maintains the adjusted angle by beingcompressed to press the second slide substrate 25 and spring fixingplate 55.

In the position adjustment mechanism 1, the spring fixing plate 55 inwhich the first screw member 72 is fixed corresponds to a first member.Also, the second slide substrate 25 through which the first screw member72 passes corresponds to a second member.

In FIG. 7, the position of the fixing substrate main body 651 of theprojector fixing substrate 65 in the condition in which the first dial71 is rotated in the clockwise direction is indicated by E. The positionof the fixing substrate main body 651 in a horizontal condition isindicated by the two-dot chain line of D.

On the contrary, by rotating the first dial 71 in the counterclockwisedirection, the threaded engagement thereof with the first screw member72 regresses, and the first dial 71 and the head 72 a of the first screwmember 72 are distanced from one another. In accordance with this, thespring fixing plate 55 rotates in a direction away from the second slidesubstrate 25 with the first turning pivot member 74, which is guided bythe first holding plate 30 and pivotal support plate 35, as the centralaxis. At this time, the first spring member 73 maintains the adjustedangle by the compression being released to press the second slidesubstrate 25 and spring fixing plate 55.

In FIG. 7, the position of the fixing substrate main body 651 of theprojector fixing substrate 65 in the condition in which the first dial71 is rotated in the counterclockwise direction is indicated by thetwo-dot chain line of F.

As heretofore described, by rotating the first dial 71, it is possibleto carry out the horizontal roll adjustment. The adjustment width of thehorizontal roll adjustment carried out by using the horizontal rollmechanism section 70 is taken to be, in the embodiment, about ±8°.However, not being limited to this adjustment angle, it is possible toset any adjustment angle as appropriate.

By rotating the first dial 71, the pivot support plate 35 to theprojector fixing substrate 65 rotate with the first turning pivot member74 as the central axis. In this case, the first screw member 72 andsecond screw member 82 move inside the first screw member relief hole254 and second screw member relief hole 255 of the second slidesubstrate 25 which they pass through, respectively.

Next, a description will be given of the up-down tilt adjustment of theposition adjustment mechanism 1.

FIG. 8 is a drawing of a condition in which the up-down tilt adjustmentis carried out, seen from the right direction. FIG. 8 shows the secondslide substrate 25 to the projector fixing substrate 65 and, forconvenience of description, others are omitted.

The up-down tilt adjustment is carried out using the up-down tiltmechanism section 80. Specifically, the angle formed by the springfixing plate 55 with respect to the second slide substrate 25 isadjusted by turning the second dial 81 shown in FIG. 8.

As shown in FIG. 8, by rotating the second dial 81 acting as a turningmember in the counterclockwise direction, the threaded engagementthereof with the second screw member 82 acting as a screw memberregresses, and the second dial 81 and the head 82 a of the second screwmember 82 are distanced from one another. In accordance with this, thespring fixing plate 55 rotates in a direction away from the second slidesubstrate 25 with the second turning pivot member 84, which is disposedperpendicular to the axial direction of the second screw member 82 andguided by the second holding plate 50 and pivotal support plate 35, asthe central axis. Because of this, it is possible to adjust the angleformed by the second slide substrate 25 and spring fixing plate 55. Atthis time, the second spring member 83 acting as a pressing membermaintains the adjusted angle by the compression being released to pressthe second slide substrate 25 and spring fixing plate 55.

In the position adjustment mechanism 1, the spring fixing plate 55 inwhich the second screw member 82 is fixed corresponds to the firstmember. Also, the second slide substrate 25 through which the secondscrew member 82 passes corresponds to the second member.

In FIG. 8, the position of the fixing substrate main body 651 of theprojector fixing substrate 65 in the condition in which the second dial81 is rotated in the counterclockwise direction is indicated by I. Theposition of the fixing substrate main body 651 in a horizontal conditionis indicated by the two-dot chain line of G.

On the contrary, by rotating the second dial 81 in the clockwisedirection, the threaded engagement thereof with the second screw member82 progresses, and the second dial 81 and the head 82 a of the secondscrew member 82 come closer. In accordance with this, the spring fixingplate 55 rotates in the direction of the second slide substrate 25 withthe second turning pivot member 84 guided by the second holding plate 50and pivotal support plate 35 as the central axis. At this time, thesecond spring member 83 maintains the adjusted angle by being compressedto press the second slide substrate 25 and spring fixing plate 55.

In FIG. 8, the position of the fixing substrate main body 651 of theprojector fixing substrate 65 in the condition in which the second dial81 is rotated in the clockwise direction is indicated by the two-dotchain line of H.

As heretofore described, by rotating the second dial 81, it is possibleto carry out the up-down tilt adjustment. The adjustment width of theup-down tilt adjustment carried out by using the up-down tilt mechanismsection 80 is taken to be, in the embodiment, about ±8°. However, notbeing limited to this adjustment angle, it is possible to set anyadjustment angle as appropriate.

By rotating the second dial 81, the pivotal support plate 35 to theprojector fixing substrate 65 rotate with the second turning pivotmember 84 as the central axis. In this case, the second screw member 82and first screw member 72 move inside the second screw member reliefhole 255 and first screw member relief hole 254 of the second slidesubstrate 25 which they pass through, respectively.

A rattling occurring due to space between component members issuppressed by the pressing forces of the first spring member 73 andsecond spring member 83 which press the second slide substrate 25 andspring fixing plate 55. Because of this, a position gap betweencomponent members after carrying out the horizontal roll adjustment andup-down tilt adjustment is prevented, and the adjusted angle is reliablymaintained. Also, by tightening the temporarily fixed fixing screws 754and 757 after carrying out the horizontal roll adjustment and up-downtilt adjustment, the position gap after the position adjustment isfurther prevented, and the adjusted angle is more reliably maintained.

Next, a description will be given of the horizontal rotation adjustmentof the position adjustment mechanism 1.

FIG. 9 is a drawing of a condition in which the horizontal rotationadjustment is carried out, seen from the up direction. FIG. 9 shows thesecond slide substrate 25 to the projector fixing substrate 65 and, forconvenience of description, others are omitted.

The horizontal rotation adjustment is carried out using the horizontalrotation mechanism section 90. Specifically, the angle formed when thethird slide substrate 60 pivots parallel to the spring fixing plate 55is adjusted by turning the third dial 91 shown in FIGS. 3 and 9.

As shown in FIG. 9, by rotating the third dial 91 acting as a turningmember in the clockwise direction, the threaded engagement thereof withthe third screw member 92 acting as a screw member progresses, and thethird dial 91 and the head 92 a of the third screw member 92 comecloser. In accordance with this, the third slide substrate 60 rotates inthe direction of the spring fixing plate 55 with the third turning pivotmember 94, which is disposed perpendicular to the axial direction of thethird screw member 92 and guided by the spring fixing plate 55 and thirdslide substrate 60, as the central axis. Because of this, it is possibleto adjust the angle formed by the spring fixing plate 55 and third slidesubstrate 60. At this time, the third spring member 93 acting as apressing member maintains the adjusted angle by being compressed topress the third slide substrate 60 and spring fixing plate 55.

When the third slide substrate 60 rotates, the displacement of thecentral axis is prevented by the sliding portion 95 a of the third pivotguide member 95, through which the third turning pivot member 94 isinserted, sliding inside the third pivot guide member hole 554 of thespring fixing plate 55. Also, the rotation is stabilized by the slidingportion 97 a of the pivoting limit guide member 97, through which thepivoting limit member 96 is inserted, sliding along the limit slot 555of the spring fixing plate 55. Also, the thickness in the up-downdirection of the horizontal rotation mechanism section 90 is made asthin as possible by using this kind of horizontal rotation mechanismsection 90.

In the position adjustment mechanism 1, the spring fixing plate 55 inwhich the third screw member 92 is fixed corresponds to the firstmember. Also, the third slide substrate 60 through which the third screwmember 92 passes corresponds to the second member.

In FIG. 9, the position of the fixing substrate main body 651 of theprojector fixing substrate 65 in the condition in which the third dial91 is rotated in the clockwise direction is indicated by K. The positionof the fixing substrate main body 651 in a condition in which it isparallel to the wall surface 900 is indicated by the two-dot chain lineof J.

On the contrary, by rotating the third dial 91 in the counterclockwisedirection, the threaded engagement thereof with the third screw member92 regresses, and the third dial 91 and the head 92 a of the third screwmember 92 are distanced from one another. In accordance with this, thethird slide substrate 60 rotates in a direction away from the springfixing plate 55 with the third turning pivot member 94 guided by thespring fixing plate 55 and third slide substrate 60 as the central axis.At this time, the third spring member 93 maintains the adjusted angle bythe compression being released to press the third slide substrate 60 andspring fixing plate 55.

In FIG. 9, the position of the fixing substrate main body 651 of theprojector fixing substrate 65 in the condition in which the third dial91 is rotated in the counterclockwise direction is indicated by thetwo-dot chain line of L.

As heretofore described, by rotating the third dial 91, it is possibleto carry out the horizontal rotation adjustment. The adjustment width ofthe horizontal rotation adjustment carried out by using the horizontalrotation mechanism section 90 is taken to be, in the embodiment, about±6°. However, not being limited to this adjustment angle, it is possibleto set any adjustment angle as appropriate.

By rotating the third dial 91, the third slide substrate 60 andprojector fixing substrate 65 rotate with the third turning pivot member94 as the central axis. In this case, the third screw member 92 movesinside the third screw member relief hole 603 of the third slidesubstrate 60 through which the third screw member 92 passes.

As heretofore described, by carrying out fine adjustments such as thehorizontal roll adjustment, up-down tilt adjustment, and horizontalrotation adjustment, it is possible to accurately align the projectionposition C with the projection region B.

According to the heretofore described embodiment, it is possible toobtain the following advantages.

According to the projector suspension device 2 of the embodiment, byusing the position adjustment mechanism 1 included in the projectorsuspension device 2, for example, in the case of the horizontal rollmechanism section 70, the first spring member 73, being disposed betweenthe spring fixing plate 55 and second slide substrate 25, presses bothmembers 55 and 25. Also, the first screw member 72, being fixed in thespring fixing plate 55, passes through the second slide substrate 25.Then, by the first dial 71 turning in threaded engagement with the firstscrew member 72 passing through the second slide substrate 25, the angleformed by the spring fixing plate 55 and second slide substrate 25 isadjusted, against the pressing force of the first spring member 73, withthe first turning pivot member 74 acting as a pivot, which is setperpendicular to the axial direction of the first screw member 72, asthe center. In this way, it is possible to configure the horizontal rollmechanism section 70 (position adjustment mechanism 1) with a simpleconfiguration including the first spring member 73, first screw member72, and first dial 71. Also, by the pressing force of the first springmember 73, it is possible to prevent a rattling due to space betweencomponent members of the horizontal roll mechanism section 70, andreliably maintain the adjusted angle. Then, by a simple operation ofturning the first dial 71, it is possible to carry out a fine adjustmentof the angle formed by the spring fixing plate 55 and second slidesubstrate 25. Because of this, it is possible to carry out a highprecision position adjustment (a fine adjustment) with respect to theangle. Consequently, it is possible to carry out a fine adjustment ofthe projection position C of the projector 5 with a high precision bythe reliable maintaining of the adjusted angle and the simple operation.The adjustments in the up-down tilt mechanism section 80 and horizontalrotation mechanism section 90 can also produce the same kinds ofadvantage as heretofore described.

In particular, when the projector 5 is the short focus projector which,including the projection optical device 47 having the reflecting mirror472, which causes an image magnification projection onto the screen S ata short distance, as in the embodiment, normally, a very small angletilt of the projector 5 leads to a large tilt of the projection positionC. However, as opposed to this, it is highly advantageous that a highprecision position adjustment (a fine adjustment) which adjusts the verysmall tilt can be reliably carried out using the suspension positionadjustment mechanism 1 of the embodiment. Moreover, it is enormouslyadvantageous that, in addition to the front-back adjustment, left-rightadjustment, and up-down adjustment, high precision three-directionposition adjustments (fine adjustments), the horizontal roll adjustment,up-down tilt adjustment, and horizontal rotation adjustment, can bereliably carried out by the suspension position adjustment mechanism 1.

According to the position adjustment mechanism 1 included in theprojector suspension device 2 of the embodiment, there being no need foran adjustor (a user or the like) to make an adjustment while holding theprojector, as heretofore known, it is possible to improve an adjustmentoperability, and it is possible to reduce a burden of the positionadjustment on the adjustor. Also, in addition, with respect to timeneeded for the position adjustment too, it being possible to carry outthe position adjustment in a shorter time than heretofore known, it ispossible to improve the efficiency of a position adjustment operation.

According to the position adjustment mechanism 1 included in theprojector suspension device 2 of the embodiment, for example, in thecase of the horizontal roll mechanism section 70, as it is configured sothat the first screw member 72 is disposed inserted through the firstspring member 73, the miniaturization of the horizontal roll mechanismsection 70 is possible in comparison with a configuration wherein thefirst screw member 72 and first spring member 73 are disposedseparately. The same applying to the cases of the up-down tilt mechanismsection 80 and horizontal rotation mechanism section 90 too, theminiaturization thereof is possible. Because of this, with the positionadjustment mechanism 1 of the embodiment, as well as it being possibleto carry out the three-direction fine adjustments, a furtherminiaturization thereof is possible. This also enables theminiaturization of the projector suspension device 2.

According to the position adjustment mechanism 1 included in theprojector suspension device 2 of the embodiment, for example, in thecase of the horizontal roll mechanism section 70, as the first springmember 73 is formed of a coil spring, it is possible to achieve afurther miniaturization of the horizontal roll mechanism section 70, andit becomes easier to design and process the first spring member 73. Thesame applying to the cases of the up-down tilt mechanism section 80 andhorizontal rotation mechanism section 90 too, a further miniaturizationof the position adjustment mechanism 1 of the embodiment is possible,and it becomes easier to design and process the first spring member 73,second spring member 83, and third spring member 93.

According to the position adjustment mechanism 1 included in theprojector suspension device 2 of the embodiment, by carrying out thehorizontal roll adjustment, up-down tilt adjustment, and horizontalrotation adjustment with respect to the mounting of the projector 5 tofine adjust the angle, it is possible to align the projection position Cof the projection image, with a high precision, with respect to theprojection region B of the screen S. In particular, in the case ofcausing an image magnification projection onto the screen S at a shortdistance, as in the embodiment, as a very small tilt of the projector 5leads to a large tilt of the projection position C, it is highlyadvantageous that the very small tilt can be adjusted. Also, theadjustor can easily adjust the angle by operating the positionadjustment mechanism 1, and a burden of the position adjustment on theuser can be reduced, thereby enabling an improvement inuser-friendliness of the position adjustment mechanism 1 (projectorsuspension device 2).

According to the position adjustment mechanism 1 included in theprojector suspension device 2 of the embodiment, it is possible toachieve the miniaturization of the position adjustment mechanism 1 and,in particular, it is possible to reduce the thickness (in the up-downdirection). Because of this, as the position adjustment mechanism 1 canbe made difficult to see by the user when the projector 5 is mounted onthe position adjustment mechanism 1, it is possible to suppress anuncomfortable feeling toward the position adjustment mechanism 1(projector suspension device 2).

The invention not being limited to the heretofore described embodiment,it is possible to implement the invention by making variousmodifications or improvements without departing from the scope thereof.

With the position adjustment mechanism 1 of the heretofore describedembodiment, for example, in the case of the horizontal roll mechanismsection 70, the first spring member 73, being disposed between thespring fixing plate 55 and second slide substrate 25, presses bothmembers 55 and 25. However, a pressing structure not being limited tothis, a configuration is also acceptable wherein the spring fixing plate55 and second slide substrate 25 are each pressed from outside (thespring fixing plate 55 is pressed from the down direction, and thesecond slide substrate 25 from the up direction). The same applies tothe structures of the up-down tilt mechanism section 80 and horizontalrotation mechanism section 90 too.

With the position adjustment mechanism 1 of the heretofore describedembodiment, for example, in the case of the horizontal roll mechanismsection 70, the first screw member 72 is disposed passing through thefirst spring member 73. However, the invention not being limited tothis, the first screw member 72 may also be disposed without passingthrough the first spring member 73. The same applies to the structuresof the up-down tilt mechanism section 80 and horizontal rotationmechanism section 90 too.

With the position adjustment mechanism 1 of the heretofore describedembodiment, for example, in the case of the horizontal roll mechanismsection 70, the first spring member 73 is formed of a coil spring.However, the invention not being limited to this, it may also be formedof a leaf spring, or the like. The same applies to the structures of theup-down tilt mechanism section 80 and horizontal rotation mechanismsection 90 too.

The position adjustment mechanism 1 of the heretofore describedembodiment is fixed to (installed on) the wall surface 900. However, theinvention not being limited to this, the position adjustment mechanism 1can also be fixed to (installed on) a ceiling by changing the shape ofthe base substrate 10, or the like, of the position adjustment mechanism1.

With the position adjustment mechanism 1 of the heretofore describedembodiment, the mounting position (angle) of the projector 5 is fineadjusted using the projector 5. However, the invention not being limitedto this, it is possible to apply the position adjustment mechanism 1 ofthe embodiment to various kinds of apparatus whose installation positionneed be fine adjusted.

The projector 5 installed on the position adjustment mechanism 1 of theheretofore described embodiment uses a lens integrator optical systemconfigured of the lens arrays 421 and 422 as the optical system(illumination optical device 42) which equalizes the illuminance of anemitted luminous flux but, the invention not being limited to this, itis also possible to use a rod integrator optical system configured of alight guide rod.

In the optical system of the projector 5 installed on the positionadjustment mechanism 1 of the heretofore described embodiment, theliquid crystal panels 451R, 451G, and 451B acting as the lightmodulation elements employ transmissive liquid crystal panels, but it isalso possible to use reflective light modulation elements such asreflective liquid crystal panels.

The projector 5 installed on the position adjustment mechanism 1 of theheretofore described embodiment employs in the optical system the liquidcrystal panels 451R, 451G, and 451B acting as the light modulationelements. However, the invention not being limited to this, any lightmodulation elements are sufficient, provided that they modulate anincident luminous flux based on an image signal, and micromirror typelight modulation elements may also be employed. As micromirror typelight modulation elements, it is possible to use, for example, digitalmicromirror devices (DMD's).

In the optical system of the projector 5 installed on the positionadjustment mechanism 1 of the heretofore described embodiment, the lightmodulation elements employ a so-called three panel system of aconfiguration wherein the three liquid crystal panels 451R, 451G, and451B are used corresponding to the red color light, green color light,and blue color light. However, the invention not being limited to this,a single panel system may also be employed. Also, a liquid crystal panelfor improving contrast may be added and employed.

In the optical system of the projector 5 installed on the positionadjustment mechanism 1 of the heretofore described embodiment, the lightsource lamp 41, not being limited to the configuration described in theheretofore described embodiment, may also be configured of any kind ofsolid light emitting element, such as a laser diode, a light emittingdiode (LED), an organic electro luminescence (EL) element, a siliconlight emitting element, or the like.

The present application claim priority from Japanese Patent ApplicationNo. 2009-145049 filed on Jun. 18, 2009, which is hereby incorporated byreference in its entirety.

What is claimed is:
 1. A projector suspension device for a projectorcomprising: a base to be fixed to a base fixing location on a surface onwhich the projector projects an image, the base fixing location beingdifferent from a projected image location on the surface; a supportmember extending from the base, and configured to support the projector;and an adjustment mechanism configured to adjust a tilt of the projectorand including a first turning member that adjusts a tilt of theprojector about a first axis that is perpendicular to the surface onwhich the projector projects the image, a second turning member that isdifferent from the first turning member and that adjusts a tilt of theprojector about a second axis that is parallel to the surface on whichthe projector projects the image and a horizontal plane, a third turningmember that is different from the first turning member and the secondturning member and that adjusts the projector in a direction of rotationabout a third axis that is perpendicular to the first axis and thesecond axis, a first holding plate that holds a first turning pivotmember, the first turning pivot member acting as a pivot for carryingout adjustment by the first turning member, a second holding plate thatholds a second turning pivot member, the second turning pivot memberacting as a pivot for carrying out adjustment by the second turningmember, and a pivotal support plate that links the first holding plateand the second holding plate and pivotally supports the first turningpivot member and the second turning pivot member.
 2. The projectorsuspension device according to claim 1, wherein the support memberincludes a first support member fixed to the base and a second supportmember movable relative to the first support member.
 3. The projectorsuspension device according to claim 2, wherein the second supportmember is movable along a direction perpendicular to the surface onwhich the projector projects the image.
 4. The projector suspensiondevice according to claim 1, wherein the adjustment mechanism is furtherconfigured to adjust a position of the projector in a direction parallelto the second axis.
 5. The projector suspension device according toclaim 1, wherein the pivotal support plate is pivotally fixed to thefirst holding plate by the first turning pivot member and is pivotallyfixed to the second holding plate by the second turning pivot member. 6.The projector suspension device according to claim 1, wherein an axialdirection of the first turning pivot member is parallel to the firstaxis, and an axial direction of the second turning pivot member isparallel to the second axis.
 7. A projector suspension device for aprojector comprising: a base to be fixed to a base fixing location on asurface on which the projector projects an image, the base fixinglocation being different from a projected image location on the surface;a support member extending from the base and configured to support theprojector; and an adjustment mechanism configured to adjust a tilt ofthe projector and including a second turning member that adjusts a tiltof the projector about a second axis that is parallel to the surface onwhich the projector projects the image and a horizontal plane, a thirdturning member that is different from the second turning member and thatadjusts the projector in a direction of rotation about a third axis thatis perpendicular to the second axis and a first axis that isperpendicular to the surface on which the projector projects the image,a second holding plate that holds a second turning pivot member, thesecond turning pivot member acting as a pivot for carrying outadjustment by the second turning member, and a pivotal support platethat pivotally supports the second turning pivot member.
 8. Theprojector suspension device according to claim 7, wherein the supportmember includes a first support member fixed to the base and a secondsupport member movable relative to the first support member.
 9. Theprojector suspension device according to claim 8, wherein the secondsupport member is movable along a direction perpendicular to the surfaceon which the projector projects the image.
 10. The projector suspensiondevice according to claim 7, wherein the adjustment mechanism furtherincludes a first turning member that is different from the secondturning member and the third turning member and that adjusts a tilt ofthe projector about the first axis.
 11. A projector suspension devicefor a projector comprising: a base to be fixed to a wall surface; asupport member extending from the base, and configured to support theprojector; and an adjustment mechanism configured to adjust a tilt ofthe projector and including a first turning member that adjusts a tiltof the projector about a first axis that is perpendicular to the wallsurface, a second turning member that is different from the firstturning member and that adjusts a tilt of the projector about a secondaxis that is parallel to the wall surface and a horizontal plane, and athird turning member that is different from the first turning member andthe second turning member and that adjusts the projector in a directionof rotation about a third axis that is perpendicular to the first axisand the second axis, a first holding plate that holds a first turningpivot member, the first turning pivot member acting as a pivot forcarrying out adjustment by the first turning member, a second holdingplate that holds a second turning pivot member, the second turning pivotmember acting as a pivot for carrying out adjustment by the secondturning member, and a pivotal support plate that links the first holdingplate and the second holding plate and pivotally supports the firstturning pivot member and the second turning pivot member.
 12. Theprojector suspension device according to claim 11, wherein the supportmember includes a first support member fixed to the base and a secondsupport member movable relative to the first support member.
 13. Theprojector suspension device according to claim 12, wherein the secondsupport member is movable along a direction perpendicular to the wallsurface.
 14. The projector suspension device according to claim 11,wherein the adjustment mechanism is further configured to adjust aposition of the projector in a direction parallel to the second axis.15. A projector suspension device for a projector comprising: a base tobe fixed to a wall surface; a support member extending from the base,and configured to support the projector; and an adjustment mechanismconfigured to adjust a tilt of the projector and including a secondturning member that adjusts a tilt of the projector about a second axisthat is parallel to the wall surface and a horizontal plane, a thirdturning member that is different from the second turning member and thatadjusts the projector in a direction of rotation about a third axis thatis perpendicular to the second axis and a first axis that isperpendicular to the wall surface, a second holding plate that holds asecond turning pivot member, the second turning pivot member acting as apivot for carrying out adjustment by the second turning member, and apivotal support plate that pivotally supports the second turning pivotmember.
 16. The projector suspension device according to claim 15,wherein the support member includes a first support member fixed to thebase and a second support member movable relative to the first supportmember.
 17. The projector suspension device according to claim 16,wherein the second support member is movable along a directionperpendicular to the wall surface.
 18. The projector suspension deviceaccording to claim 15, wherein the adjustment mechanism further includesa first turning member that is different from the second turning memberand the third turning member and that adjusts a tilt of the projectorabout the first axis.